Manchester United have approached Bayern Munich over a deal for centre-back Jerome Boateng, according to Sky in Germany.
The Premier League side believe their Bundesliga counterparts will ask for around £45m to allow the Germany international to leave the Allianz Arena.
It is understood that Boateng - who spent a season at United's bitter rivals Manchester City - could be open to a move to Old Trafford.
However, United are not the only side who are interested in the 73-cap international. Bayern chief executive Karl-Heinz Rummenigge said last month that Boateng was in talks with PSG.